diff --git a/concourse/docker/Dockerfile b/concourse/docker/Dockerfile
index e34bf09a5..7cd4ceb99 100644
--- a/concourse/docker/Dockerfile
+++ b/concourse/docker/Dockerfile
@@ -8,6 +8,7 @@ RUN apt-get update && apt-get install -y \
   git \
   jq \
   openjdk-8-jdk \
+  openjdk-8-source \
   curl \
   xvfb \
   icewm